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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9a742b179b402e641bcb1475761b0a1e557f7114d816d68717bbf2f68798ed5' 
  AND token = 'W8VJ3vo8N8U+U8dLBpUuc/OFhKZ4F1OqUHC0UAv+op8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}